South Korean shout slogans during a rally denouncing North Korea's latest nuclear test in Seoul, South Korea, Monday, Sept. 12, 2016. North Korea is capable of detonating another nuclear device anytime at one of its unused tunnels at the country's main atomic test site, Seoul official said Monday,

The Associated Press

South Korean shout slogans during a rally denouncing North Korea's latest nuclear test in Seoul, South Korea, Monday, Sept. 12, 2016. North Korea is capable of detonating another nuclear device anytime at one of its unused tunnels at the country's main atomic test site, Seoul official said Monday, three days after the country carried out its fifth bomb explosion. The letters read "Overthrow Kim Jong Un." (AP Photo/Lee Jin-man)

South Korean shout slogans during a rally denouncing North Korea's latest nuclear test in Seoul, South Korea, Monday, Sept. 12, 2016. North Korea is capable of detonating another nuclear device anytime at one of its unused tunnels at the country's main atomic test site, Seoul official said Monday, three days after the country carried out its fifth bomb explosion. The letters read "Overthrow Kim Jong Un." (AP Photo/Lee Jin-man) (The Associated Press)

South Korean shout slogans during a rally denouncing North Korea's latest nuclear test in Seoul, South Korea, Monday, Sept. 12, 2016. North Korea is capable of detonating another nuclear device anytime at one of its unused tunnels at the country's main atomic test site, Seoul official said Monday, three days after the country carried out its fifth bomb explosion. The letters read "Overthrow Kim Jong Un." (AP Photo/Lee Jin-man)